LTC4270/LTC4271

31

42701f

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

PACKAGE DESCRIPTION

UKG Package

52-Lead Plastic QFN (7mm

× 8mm)

(Reference LTC DWG # 05-08-1729 Rev Ø)

7.00 0.10

(2 SIDES)

NOTE:

1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE, IF PRESENT

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE

PIN 1 TOP MARK

(SEE NOTE 6)

PIN 1 NOTCH

R = 0.30 TYP OR

0.35 ¥ 45C

CHAMFER

0.40 0.10

52

51

1

2

BOTTOM VIEW—EXPOSED PAD

TOP VIEW

SIDE VIEW

6.50 REF

(2 SIDES)

8.00 0.10

(2 SIDES)

5.50 REF

(2 SIDES)

0.75 0.05

0.75 0.05

R = 0.115

TYP

R = 0.10

TYP

0.25 0.05

0.50 BSC

0.200 REF

0.00 – 0.05

6.45 0.10

5.41 0.10

0.00 – 0.05

(UKG52) QFN REV Ø 0306

5.50 REF

(2 SIDES)

5.41 0.05

6.45 0.05

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED

0.70 0.05

6.10 0.05

7.50 0.05

6.50 REF

(2 SIDES)

7.10 0.05

8.50 0.05

0.25 0.05

0.50 BSC

PACKAGE OUTLINE